package NIO;

import org.junit.Test;

import java.io.IOException;
import java.net.InetSocketAddress;
import java.nio.ByteBuffer;
import java.nio.channels.FileChannel;
import java.nio.channels.ServerSocketChannel;
import java.nio.channels.SocketChannel;
import java.nio.file.Paths;
import java.nio.file.StandardOpenOption;

public class TestBlockingNIO {

    @Test
    public void client() throws IOException {
        SocketChannel sChannel = SocketChannel.open(
                new InetSocketAddress("127.0.0.1", 8989));

        FileChannel inChannel = FileChannel.open(
                Paths.get("src/NIO/1.jpg"), StandardOpenOption.READ, StandardOpenOption.WRITE);

        ByteBuffer buf = ByteBuffer.allocate(1024);

        while (inChannel.read(buf) != -1){
            buf.flip();
            inChannel.write(buf);
            buf.clear();
        }

        sChannel.shutdownOutput();

        // 接收服务端的反馈
        int len = 0;
        while ((len = sChannel.read(buf)) != -1){
            buf.flip();
            System.out.println(new String(buf.array(), 0, len));
            buf.clear();
        }

        inChannel.close();
        sChannel.close();
    }

    @Test
    public void server() throws IOException {
        ServerSocketChannel ssChannel = ServerSocketChannel.open();

        FileChannel outChannel = FileChannel.open(Paths.get("src/NIO/2.jpg"),
                StandardOpenOption.WRITE, StandardOpenOption.CREATE);

        ssChannel.bind(new InetSocketAddress(8989));

        SocketChannel sChannel = ssChannel.accept();

        ByteBuffer buf = ByteBuffer.allocate(1024);

        while (sChannel.read(buf) != -1){
            buf.flip();
            sChannel.write(buf);
            buf.clear();
        }

        // 发送反馈给客户端
        buf.put("服务端接收成功！".getBytes());
        buf.flip();
        sChannel.write(buf);

        sChannel.close();
        outChannel.close();
        ssChannel.close();
    }
}
